Transport, refraction, and interface arcs in junctions of Weyl semimetals

Buccheri, Francesco; Egger, Reinhold; Martino, Alessandro De

doi:10.1103/physrevb.106.045413

Cited by 19 publications

(4 citation statements)

References 76 publications

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“…The surface states of the Weyl semimetal, i.e., Fermi arcs, propagate in-plane, while decay occurs [30][31][32][33] along the out-plane direction, as shown in Figure 1c. The decayed amplitude of the surface state is given by → E k x , k y e −k z ∆z at a specific k x , k y position, where ∆z represents the distance away from the surface, as shown in Figure 1c.…”

Section: Topological Waveguide Modesmentioning

confidence: 99%

Photonic Weyl Waveguide and Saddle-Chips-like Modes

Wang,

Xu,

Zhu

et al. 2024

Nanomaterials

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Topological Weyl semimetals are characterized by open Fermi arcs on their terminal surfaces, these materials not only changed accepted concepts of the Fermi loop but also enabled many exotic phenomena, such as one-way propagation. The key prerequisite is that the two terminal surfaces have to be well separated, i.e., the Fermi arcs are not allowed to couple with each other. Thus, their interaction was overlooked before. Here, we consider coupled Fermi arcs and propose a Weyl planar waveguide, wherein we found a saddle-chips-like hybridized guiding mode. The hybridized modes consist of three components: surface waves from the top and bottom surfaces and bulk modes inside the Weyl semimetal. The contribution of these three components to the hybridized mode appears to be z-position-dependent rather than uniform. Beyond the conventional waveguide framework, those non-trivial surface states, with their arc-type band structures, exhibit strong selectivity in propagation direction, providing an excellent platform for waveguides. Compared with the conventional waveguide, the propagation direction of hybridized modes exhibits high z-position-dependency. For example, when the probe plane shifts from the top interface to the bottom interface, the component propagating horizontally becomes dimmer, while the component propagating vertically becomes brighter. Experimentally, we drilled periodic holes in metal plates to sandwich an ideal Weyl meta-crystal and characterize the topological guiding mode. Our study shows the intriguing behaviors of topological photonic waveguides, which could lead to beam manipulation, position sensing, and even 3D information processing on photonic chip. The Weyl waveguide also provides a platform for studying the coupling and the interaction between surface and bulk states.

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Section: Topological Waveguide Modesmentioning

confidence: 99%

Photonic Weyl Waveguide and Saddle-Chips-like Modes

Wang,

Xu,

Zhu

et al. 2024

Nanomaterials

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“…Considering the surface states of Weyl semimetal, i.e. Fermi arcs, they propagate in-plane while undergoes decay [26][27][28][29] along the out-plane direction as shown in Figs. 1c and d.…”

Section: Topological Waveguide Modesmentioning

confidence: 99%

Photonic Weyl waveguide and saddle-chips-like modes

Wang,

xu,

Hong

et al. 2024

Preprint

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Topological Weyl semimetals are characterized by open Fermi arcs on their terminal surfaces, which not only renewed our well-accepted concepts of the Fermi loop but also enabled many exotic phenomena, such as one-way propagation. The key prerequisite is that the two terminal surfaces have to be well-separated far away, i.e. the Fermi arcs are not allowed to couple with each other. Thus, their interaction was overlooked before. Here, we consider the coupled Fermi arcs and propose a Weyl planar waveguide, where we found a saddle-chips-like guiding mode. Compared with the conventional waveguiding mode, the new guiding mode propagates along different directions depending on the vertical excitation position. Experimentally, we drill periodic holes in metal plates to sandwich an ideal Weyl meta-crystal and characterize the topological guiding mode. Our study shows the intriguing behaviors of topological photonic waveguides, which could lead to beam manipulation, position sensing, and even 3D information processing on photonic chips.

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“…Fermi arcs bridging Weyl points offer insights into topological semimetal phases 1 – 10 and exotic phenomena such as chiral anomaly 11 , 12 and nontrivial surface states 13 – 15 . Very recently, manipulating Fermi arcs has further stimulated more interests, e.g., possible transport properties in junctions of Weyl semimetals 16 , quantized chiral magnetic current 17 , and Fermi arc reconstruction in synthetic photonic lattice 18 , etc. Understanding, constructing and manipulating Fermi arcs 19 – 21 can lead to the development of novel electronic/photonic devices and quantum technologies, just like the reconstruction of Fermi loop surface states, which have been cleverly demonstrated in magnetically tunable 3D photonic crystals 22 with the closed topological surface states extending across the surface Brillouin zone in the forms of torus knots.…”

Section: Introductionmentioning

confidence: 99%

Twisted photonic Weyl meta-crystals and aperiodic Fermi arc scattering

Wang,

Xu,

Wei

et al. 2024

Nat Commun

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As a milestone in the exploration of topological physics, Fermi arcs bridging Weyl points have been extensively studied. Weyl points, as are Fermi arcs, are believed to be only stable when preserving translation symmetry. However, no experimental observation of aperiodic Fermi arcs has been reported so far. Here, we continuously twist a bi-block Weyl meta-crystal and experimentally observe the twisted Fermi arc reconstruction. Although both the Weyl meta-crystals individually preserve translational symmetry, continuous twisting operation leads to the aperiodic hybridization and scattering of Fermi arcs on the interface, which is found to be determined by the singular total reflection around Weyl points. Our work unveils the aperiodic scattering of Fermi arcs and opens the door to continuously manipulating Fermi arcs.

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Transport, refraction, and interface arcs in junctions of Weyl semimetals

Cited by 19 publications

References 76 publications

Photonic Weyl Waveguide and Saddle-Chips-like Modes

Photonic Weyl Waveguide and Saddle-Chips-like Modes

Photonic Weyl waveguide and saddle-chips-like modes

Twisted photonic Weyl meta-crystals and aperiodic Fermi arc scattering

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